Electromagnetic induction type position sensor
First Claim
1. An electromagnetic induction type position sensor comprising:
- AC magnetic flux generating means for generating an AC magnetic flux which repeatedly becomes strong and weak substantially at a wavelength λ
in a movement direction of a position detection target; and
a plurality of coils which receives the AC magnetic flux to output electromagnetic induction voltages different from each other in phase of an amplitude change,wherein each coil includes a plurality of conductive patterns formed in each of an even number of layers laminated via insulating materials,a shape of each conductive pattern is a sinusoidal shape at the wavelength λ
extending in the movement direction of the position detection target,each conductive pattern pairs with the sinusoidal conductive pattern in a reverse phase formed at the same position in another layer,two or more conductive patterns of the plurality of conductive patterns constituting a same coil and formed in the same layer are adjacently arranged with a space between them in an amplitude direction of the sinusoidal shape, andall of the conductive patterns constituting a same coil are connected in series so that a direction of an electric current of these conductive patterns is opposite to that of the paired conductive patterns when viewed from a front of the layers.
1 Assignment
0 Petitions
Accused Products
Abstract
An electromagnetic induction type position sensor comprises an AC magnetic flux generating device which generates AC magnetic flux substantially at a wavelength λ, and a plurality of coils which receives the AC magnetic flux to output electromagnetic induction voltages. Each coil includes a plurality of sinusoidal conductive patterns at a wavelength λ formed in each of an even number of layers laminated via insulating materials. The plurality of conductive patterns formed in a same layer is arranged with a space between them in an amplitude direction of the sinusoidal shape, and is formed at the same position as a plurality of conductive patterns formed in another adjacent layer, and its amplitude is in a reverse phase to that of the plurality of conductive patterns formed in the other adjacent layer. All the conductive patterns constituting the same coil are connected in series so that a direction of an electric current of these conductive patterns is opposite to that of the conductive patterns in reverse phases when viewed from the front of the layers.
-
Citations
4 Claims
-
1. An electromagnetic induction type position sensor comprising:
-
AC magnetic flux generating means for generating an AC magnetic flux which repeatedly becomes strong and weak substantially at a wavelength λ
in a movement direction of a position detection target; anda plurality of coils which receives the AC magnetic flux to output electromagnetic induction voltages different from each other in phase of an amplitude change, wherein each coil includes a plurality of conductive patterns formed in each of an even number of layers laminated via insulating materials, a shape of each conductive pattern is a sinusoidal shape at the wavelength λ
extending in the movement direction of the position detection target,each conductive pattern pairs with the sinusoidal conductive pattern in a reverse phase formed at the same position in another layer, two or more conductive patterns of the plurality of conductive patterns constituting a same coil and formed in the same layer are adjacently arranged with a space between them in an amplitude direction of the sinusoidal shape, and all of the conductive patterns constituting a same coil are connected in series so that a direction of an electric current of these conductive patterns is opposite to that of the paired conductive patterns when viewed from a front of the layers. - View Dependent Claims (2, 3, 4)
-
Specification